文档介绍：南京邮电大学
硕士学位论文
基于回声隐藏方法的音频数字水印中回声核的研究
姓名:张磊
申请学位级别:硕士
专业:信号与信息处理
指导教师:张玲华
2011-03
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南京邮电大学硕士研究生学位论文摘要
摘要
音频数字水印是一种信息隐藏技术,它是一种在不对音频载体信号产生过分影响的条
件下将额外的信息嵌入到数字媒体中以实现隐蔽通信、版权保护等功能的技术。回声隐藏
是音频信息隐藏的一个重要分支。本文的主要工作及创新点如下:
(1)对音频数字水印技术的概念、基本架构、特性、分类、应用、评价标准以及发
展状况进行了总结和归纳。介绍了回声隐藏的概念、特性及基本原理,分析了回声隐藏的
研究现状、发展趋势和将来的研究重点。
(2)详细介绍并研究了 Kim 的前后向回声核,在分析并进行数学推导的基础上提出
了可以在倒谱图上看到倒峰值的回声引入算法,增大了嵌入信息的容量。
(3)在研究 Kim 提出的前后向回声核技术的基础上,结合双边时域扩展思想,提出
了一种利用 PN 序列改进回声内核的隐藏算法。一方面该算法有别于传统的时间域嵌入-倒
谱域提取算法,使得水印的嵌入和提取均在时间域完成,在回声幅度很小的情况下保持高
检测率;另一方面使用 PN 序列对回声内核的改进提高了水印的安全性和不可见性。

关键词:音频数字水印;回声隐藏;回声核;倒谱检测
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南京邮电大学硕士研究生学位论文 Abstract
Abstract
Audio digital watermarking technology is a kind of information hiding technology,
Information hiding is a technology which embeds the important data into the digital audio to hide
the existence information for copyright identification or munication. Echo hiding
is an important branch of the information hiding based on audio signals. The main work and
innovation points of this paper are as follow:
At first, this paper introduces the concept, the basic structure, characteristics, classification,
application, evaluation criteria and the development status of digital audio watermarking
technology. Then, the paper introduces the concept, principle and characteristic of echo hiding,
and analyzes its current situation, developmental trend and the key research points in future.
Secondly,Kim` s backward and forward kernels is detailed studied and introduced in this
paper. After analyzing and Mathematical deduction,this paper proposes a new system of
echo hiding which can make us see the pour peak in the cepstrum , then test it, and at last ,
combines with the more echo to expand the information capacity embedded.
Thirdly, on the basis of Kim’s backward and forward kernels, this paper propose an echo
hiding algorithm which improve the echo kernel by the PN bining the Bilateral
time-domain ex